[Intel-gfx] [PATCH] drm/i915/gtt: Always acquire struct_mutex for gen6_ppgtt_cleanup

Tvrtko Ursulin tvrtko.ursulin at linux.intel.com
Thu May 23 09:21:17 UTC 2019


On 23/05/2019 07:49, Chris Wilson wrote:
> We rearranged the vm_destroy_ioctl to avoid taking struct_mutex, little
> realising that buried underneath the gen6 ppgtt release path was a
> struct_mutex requirement (to remove its GGTT vma). Until that
> struct_mutex is vanquished, take a detour in gen6_ppgtt_cleanup to do
> the i915_vma_destroy from inside a worker under the struct_mutex.
> 
> <4> [257.740160] WARN_ON(debug_locks && !lock_is_held(&(&vma->vm->i915->drm.struct_mutex)->dep_map))
> <4> [257.740213] WARNING: CPU: 3 PID: 1507 at drivers/gpu/drm/i915/i915_vma.c:841 i915_vma_destroy+0x1ae/0x3a0 [i915]
> <4> [257.740214] Modules linked in: snd_hda_codec_hdmi i915 x86_pkg_temp_thermal mei_hdcp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core r8169 realtek snd_pcm mei_me mei prime_numbers lpc_ich
> <4> [257.740224] CPU: 3 PID: 1507 Comm: gem_vm_create Tainted: G     U            5.2.0-rc1-CI-CI_DRM_6118+ #1
> <4> [257.740225] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
> <4> [257.740249] RIP: 0010:i915_vma_destroy+0x1ae/0x3a0 [i915]
> <4> [257.740250] Code: 00 00 00 48 81 c7 c8 00 00 00 e8 ed 08 f0 e0 85 c0 0f 85 78 fe ff ff 48 c7 c6 e8 ec 30 a0 48 c7 c7 da 55 33 a0 e8 42 8c e9 e0 <0f> 0b 8b 83 40 01 00 00 85 c0 0f 84 63 fe ff ff 48 c7 c1 c1 58 33
> <4> [257.740251] RSP: 0018:ffffc90000aafc68 EFLAGS: 00010282
> <4> [257.740252] RAX: 0000000000000000 RBX: ffff8883f7957840 RCX: 0000000000000003
> <4> [257.740253] RDX: 0000000000000046 RSI: 0000000000000006 RDI: ffffffff8212d1b9
> <4> [257.740254] RBP: ffffc90000aafcc8 R08: 0000000000000000 R09: 0000000000000000
> <4> [257.740255] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8883f4d5c2a8
> <4> [257.740256] R13: ffff8883f4d5d680 R14: ffff8883f4d5c668 R15: ffff8883f4d5c2f0
> <4> [257.740257] FS:  00007f777fa8fe40(0000) GS:ffff88840f780000(0000) knlGS:0000000000000000
> <4> [257.740258] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> <4> [257.740259] CR2: 00007f777f6522b0 CR3: 00000003c612a006 CR4: 00000000001606e0
> <4> [257.740260] Call Trace:
> <4> [257.740283]  gen6_ppgtt_cleanup+0x25/0x60 [i915]
> <4> [257.740306]  i915_ppgtt_release+0x102/0x290 [i915]
> <4> [257.740330]  i915_gem_vm_destroy_ioctl+0x7c/0xa0 [i915]
> <4> [257.740376]  ? i915_gem_vm_create_ioctl+0x160/0x160 [i915]
> <4> [257.740379]  drm_ioctl_kernel+0x83/0xf0
> <4> [257.740382]  drm_ioctl+0x2f3/0x3b0
> <4> [257.740422]  ? i915_gem_vm_create_ioctl+0x160/0x160 [i915]
> <4> [257.740426]  ? _raw_spin_unlock_irqrestore+0x39/0x60
> <4> [257.740430]  do_vfs_ioctl+0xa0/0x6e0
> <4> [257.740433]  ? lock_acquire+0xa6/0x1c0
> <4> [257.740436]  ? __task_pid_nr_ns+0xb9/0x1f0
> <4> [257.740439]  ksys_ioctl+0x35/0x60
> <4> [257.740441]  __x64_sys_ioctl+0x11/0x20
> <4> [257.740443]  do_syscall_64+0x55/0x1c0
> <4> [257.740445]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> References: e0695db7298e ("drm/i915: Create/destroy VM (ppGTT) for use with contexts")
> Fixes: 7f3f317a66ca ("drm/i915: Restore control over ppgtt for context creation ABI")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gem_gtt.c | 32 +++++++++++++++++++++++++++--
>   drivers/gpu/drm/i915/i915_gem_gtt.h |  2 ++
>   2 files changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 9ed41aefb456..5a350251766a 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -1828,11 +1828,33 @@ static void gen6_ppgtt_free_pd(struct gen6_hw_ppgtt *ppgtt)
>   			free_pt(&ppgtt->base.vm, pt);
>   }
>   
> +struct gen6_ppgtt_cleanup_work {
> +	struct work_struct base;
> +	struct i915_vma *vma;
> +};
> +
> +static void gen6_ppgtt_cleanup_work(struct work_struct *wrk)
> +{
> +	struct gen6_ppgtt_cleanup_work *work =
> +		container_of(wrk, typeof(*work), base);
> +	struct drm_i915_private *i915 = work->vma->vm->i915;

Does the sequence need an extra reference on ppgtt for dereferencing the 
vm here? Alternatively storing i915 in the work struct could work around 
that.

Regards,

Tvrtko

> +
> +	mutex_lock(&i915->drm.struct_mutex);
> +	i915_vma_destroy(work->vma);
> +	mutex_unlock(&i915->drm.struct_mutex);
> +
> +	kfree(work);
> +}
> +
>   static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
>   {
>   	struct gen6_hw_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm));
> +	struct gen6_ppgtt_cleanup_work *work = ppgtt->work;
>   
> -	i915_vma_destroy(ppgtt->vma);
> +	/* FIXME remove the struct_mutex to bring the locking under control */
> +	INIT_WORK(&work->base, gen6_ppgtt_cleanup_work);
> +	work->vma = ppgtt->vma;
> +	schedule_work(&work->base);
>   
>   	gen6_ppgtt_free_pd(ppgtt);
>   	gen6_ppgtt_free_scratch(vm);
> @@ -2011,9 +2033,13 @@ static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
>   
>   	ppgtt->base.vm.pte_encode = ggtt->vm.pte_encode;
>   
> +	ppgtt->work = kmalloc(sizeof(*ppgtt->work), GFP_KERNEL);
> +	if (!ppgtt->work)
> +		goto err_free;
> +
>   	err = gen6_ppgtt_init_scratch(ppgtt);
>   	if (err)
> -		goto err_free;
> +		goto err_work;
>   
>   	ppgtt->vma = pd_vma_create(ppgtt, GEN6_PD_SIZE);
>   	if (IS_ERR(ppgtt->vma)) {
> @@ -2025,6 +2051,8 @@ static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
>   
>   err_scratch:
>   	gen6_ppgtt_free_scratch(&ppgtt->base.vm);
> +err_work:
> +	kfree(ppgtt->work);
>   err_free:
>   	kfree(ppgtt);
>   	return ERR_PTR(err);
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index 98fc71053f7c..38496039456b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -424,6 +424,8 @@ struct gen6_hw_ppgtt {
>   
>   	unsigned int pin_count;
>   	bool scan_for_unused_pt;
> +
> +	struct gen6_ppgtt_cleanup_work *work;
>   };
>   
>   #define __to_gen6_ppgtt(base) container_of(base, struct gen6_hw_ppgtt, base)
> 


More information about the Intel-gfx mailing list